More than 25,000 enemy fighters have been killed; swaths of territory reclaimed in Iraq and Syria

WASHINGTON—The U.S. commander overseeing the coalition fighting Islamic State in Iraq and Syria said it has made progress but cautioned that the extremist group continues to pose a danger.

The U.S., Iraq and its allies have killed more than 25,000 enemy fighters and reclaimed swaths of territory from the militant group in Iraq and Syria, trained nearly 14,000 Iraqi forces and struck at Islamic State’s oil and gas assets, said Lt. Gen. Sean MacFarland.